New vat dye.



10 thracene series.

35 and 8 parts of water.

40 vat with hydrosulfite PEUL THOIVIASCHEWSKI, OF VOHWINKEL, NEARELBEBFELD, GERMANY, ASSIG'NOR 1'0 FARBENFABRIKEN VOBM. FBIEDR. BAYER 8500., F ELTBERFELD,

COR'POB-ATIQN or GERMANY.

No Drawing.

To all whom it may concern:

Be it known that I, PAUL THOMASCHEWSKI, doctor of philosophy, chemist,citizen of the German Empire, residing at Vohwinkel,

5 nearElberfeld, Germany, have invented. new

and useful Improvements in New Vat Dyes, of which the following is aspecification.

My invention relates to the manufacture and production of new vat dyesof the-an- The process for their production consists in treatinganthraquinone inercaptans or the disultids (obtained from mercaptans byoxidation) with alkali polysulfids to such temperatures that dyesinsoluble in water are obtained. Instead of H181- captans themselvesproducts, which by the action of alkali polysultids yield inercaptanscan be used, such. as 'rhodanids, Xtlllthogenates, halogen substitutedanthraquinones, anthraquinone sull'onic acids.

The new dyes are after being dried and pulverized fro-1n brown to blackpowders which are insoluble in 'ater, alkalies, alkaline sulfide andorganic solvents. They yieldon treatment with hydrosulfite and causticalkali vats suitable for dyeing cotton from olive to gray tobrownish-black fast shades. I

In order to illustrate the new process more fully the following exampleis given, the

parts being by weight :1 part of l-aminoanthraquinone-5-sulfonic acid isheated in an autoclave to 170 C. for 10 hours with 2 parts of sulfur, 10parts of crystallized Na s After cooling the product of the reaction isfiltered oil and washed with hot water. The new dye is a black powdersoluble in concentrated sulfuric acid with a black-brown color. The andNaOH has a greenish-black color. It dyes cotton fastgreenish-black-brown shades. Quite similar Specification of LettersPatent.

Application filed February 19, 1910.

GERMANY, A

NEW VAT DYE.

Patented June 14, 191d.

Serial No. 544,867.

properties show the dyes obtained from 1- aniinoanthraquinone-S-sultonicacid or from a mixture of these two acids. The dyes obtained fromanthraquinone-lor 2-1nercaptan dye cotton grayish-brown. The dyeobtained from anthraquinone 1.5 disulfonic acid and polysulfids dyes areddish-blackbrown.

Other niercaptans, etc, may be used c. g.2-inethylanthraquinone-l-inercaptan, ,etor5-a1ninoanthraquinone-l-niercaptan, etc.

I claim 1 1.. The herein described new dyes obtainable troin thehereinbetore defined anthraqu-inone derlvatives, especially anthraquinone inercaptans and anthraquinone derivatives yielding lnercaptans'with alkali polysulfids, which dyes are after being dried and pulverizedfrom brown to black powders wl' 'ch are insoluble in water, alkalies,alkaline sulfids and organic solvents, giving vats with hydrosulfite andcaustic soda lye, which vats dye cotton from olive to gray tobrownish-black fast shades, substantially as described.

2. The herein described new dye obtainable from1alninoanthraquinone-5-sulfonic acid and alkali polysulfid, which isafter being dried and pulverized a black powder soluble in concentratedsulfuric acid containing 20 per cent. of S0 with a blackbrown color,forming a greenish-black vat with hydrosulfite and NaOH which vat dyescotton fast greenish-black-brown shades substantially as described.

In testimony whereof 'I have hereunto set my hand in the presence of twosubscrib ing witnesses.

PAUL THOMASGHEWSKI. [n 8.]

Witnesses:

OTTO Ktime, CHAS. J. WRIGHT.

